package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /***
     * 添加商品进入购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断在购物车中是否存在
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //存在则更新数量
        if (list != null && list.size() > 0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            shoppingCart.setNumber(++number);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //不存在则插入数据库
            Long dishId = shoppingCartDTO.getDishId();
            //添加的是菜品
            if (dishId != null){
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setName(dish.getName());
            }else {
                //添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.selectById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /***
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> listAll() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /***
     * 清空购物车
     */
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /***
     * 减少商品
     * @param shoppingCartDTO
     */
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0){
            shoppingCart = list.get(0);
            //数量不为1，数量减1
            if (shoppingCart.getNumber() > 1){
                Integer number = shoppingCart.getNumber();
                shoppingCart.setNumber(--number);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }else {
                //数量为1，删除
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }
    }
}
